Mechanical movement



W. A. BUTCHART.

- MECHANICAL MOVEMENT.

APPLlCATION FILED MAR. 19 1919- Patented Feb. 1,1 921.

2 S HEETSSHEET 1- INVENTOR. WA. BUTCHAR T W. A. BUTCHART.

MECHANICAL MOVEMENT. APFL|CATION mm MAR. 19. 1 919.

Pfitented Feb. 1,1921.

2 SHEETS-SHEET 2.

INVENTOR. I WA. BUTCHARZ' W A TT UNlTED STATES WILLIAM A. BUTCHART, OF DENVER, GOLORA DO.

MECHANICAL MOVEMENT.

Specification of Letters Patent.

Patented Feb. 1, 1921.

Application filed March 19, 1919. Serial No. 283,524.

5'." 0 all whom it may concern:

Be it known that I. VVrLmAM A. Borou- ART, a citizen of the United States, residing at Denver, in the county of Denver and State of Colorado, have invented certain new and useful Improvements in Mechanical Movements, of which the following is a specificatron.

This invention relates to mechanical movements of the type used to impart a reciprocating motion to a movably mounted of drawings ,in which like characters of reference designate corresponding; parts throughout the several views and in which- Figure 1 represents a plan view of the mechanical movement,

Fig. 2, a fragmentary and partially sectional side elevation of the same and Fig. 3, a partially sectional front elevation of the movement looking in the direction of the arrowA, Fig. 2.

The reference character 2 designates the base of a chair 3 upon which the reciprocao ing transmission members of the movement isslidably supported. A pillow-block 4 at the forward end of the base supports a rocker shaft 6 the end portions of which project beyond the same.

Upwardly extending rocker arms 5 fastened upon the projecting portions of the shaft by set screws 7 carry in bearings at their upper ends, a second shaft 8 for the support of a rotary pulleys). A yoke 10 which straddles the pulley is loosely connected with the shaft at opposite sides thereof, and a rod 12 fastened to the yoke passes through openings in the chair for its connection with the table, screen or other driven element to which the movement is applied. The element has been designated inFig. 1 of the drawings by the reference character 13, and it is fastened to the rod through the instrumentality of a pair of clamping nuts it which are screwed upon the threaded end portion of the same.

The chair has at its top a bearing 15 and an abutment 16 opposite thereto, which are provided with alincd openings for the passage of the connecting rod of the transmission member and it has between the bearing and the abutment, a hollow to receive the headed portion of a buffer block 17 which loosely surrounds the connecting rod and is slidably supported in the bearing 15, and. a buffer spring 23 which is coiled around the rod between the block and the abutment. The transverse portion of the yoke of the transmission member is shouldered to engage the end of the buffer block projecting through the bearing of the chair and a coiled spring 18 placed around the rod between the abutment and the adjustable collar 19 on the rod serves to yieldingly oppose the for ward motion of the transmission member by the oscillating movement of the support with which it is connected.

The collar is adjusted for the purpose of regulating the pressure of the spring. by a nut 20 which is screwed upon the threaded end portion of the rod to which the beforementioned clamping; nuts l l are applied.

The pulley 9 which is mounted for rotation on the shaft 8 carried upon the rocker arms, has an eccentric unbalanced weight 21 which when the pulley is rotated by a belt-connection with a conveniently located 1 motor, tends to displace its axis of rotation under the influence of centrifugal force.

Inthe. operation of the movement a rotary motion of the pulley in the ClllECtlOl'! of the arrow B, Fig. 2, will cause the rocker arms on which the pulley is supportedto move forwardly about the axis of oscillation of their shaft by the centrifugal force acting upon the unbalanced weight. The forward motion of the arms causes the yoke to separate fromthc buffer block by compression of the spring 18 and when during thesecond half of the revolution of the pulhey, the weight has passed the perpend1 cular, the expansion of the contracted spring aids in compelling the oscillatory support to move in the opposite direction.

The return movement of the support be yond itscenter of oscillation, brings the yoke in contact with the buffer 17. The impact of the transmission member with the element receive a differential reciprocating motion requiring the expenditure of but little mechanical energy.

In order to prevent the obviously objectionable engagement of the head or" the buffer block with the bearing in which it is supported, durin each forward motion of the oscillating element a resilient washer preferably made in the form of a light eoilec spring 22 is placed between the head of the buffer and the bearing to cushion its return 7 stroke.

Having thus described my invention what I claim and desire to secure by Letters-Patout is:

1. A mechanical movement comprising an oscillatory support a rotary unbalanced pulley thereon, a transmission-member mounted for reci rocation in connection with the sun- 1 V l port, a stationary abutment, spring bearing on the abutment and acting upon the transmission m mber to yieldin 'ly resist the movement of the support in one direction, a

sliding butler disposed to be engaged by the member during movement of the support in the opposite direction, a spring to resist the movement of the buiier bythe impact of the member, and a spring cushioning the return movement of the buffer.

7 '2. A meehanical'movement comprising an oscillatory support, a rotary unbalanced pulley thereon, a transmission-member mounted for reciprocation, in connection with the support, stationary abutment, a spring bearing onthe abutment and acting upon the transmissmn member to yieldlngly resist the movement of the support in one direction, a sliding butter disposed to be engaged by the memberduring movement of the support in the opposite direction, and a spring to resist the movement of the butter by the impact of the member.

.3. A mechanical movement comprising a base, an oscillatory support thereon, a retary unbalanced pulley on the support, a chair on the base havin a bearing, an abutment, and aimed openings therein, a hollow buffer sliding inthe bearing, a spring between the bufi'er and the abutment, a rod slidingly extending throughthe buffer and the opening of the abutment, a connection between the rod and the support, adapted to engage'the buffer during movement of the support in one direction, a collar on the rod, and a spring between the collar and the abutment to yieldingly resist the movement or" the support in the opposite direction.

1. 1L mechanical movement comprising a base, an os-icillating support thereon. a rotary unbalance e pulley on the support, a chair on the base having a bearii an abutment, and alined openings the ein, a hollow butter sliding in the bearing. a rpriu between the buffer and the mu1ueut,a cushion spring between the buii'er and the hearing,

a rod slidingly extending through the butler and the opening of the abutment, a connection between the rod and the support, adapted to engage the butler during movement of the support in one direction, a collar on the rod, and a spring between the collar and the abutment to yieldingly resi t the movement 01" the support in the opposite direction.

5. A mechanical movement comm-icing); a base, a pillow block thereon, a rocker shaft in the pillow block, upwardly extending arms on the shaft, a shaft supported at the upper ends of the arms, a rotary unbalanced pulley on the upper shaft, a chair on the base having a bearing, on abutment. and alined og ieuiugs therein, a hollow butler sliding in the bearing, a spring between the butter and the abutment. a rod slidiugly extending through the butler and the opening of the abutment, a connection between the rod and the support, adapted to engage the butter during movement of the support in one direction, a collar on the rod. and a spring between the collar and the abutment to yieldingly resist the movement of the sup port in the opposite direction.

6. A mechanical movement comprising in combination with a reciprocatory element, an oscillating support, a rotary unbalanced pulley thereon, a bearing an abutment opposite thereto, a buffer on the bearing. a rod connecting the support and the reciprocatory element, and sliding through the bearsnd the abutment. a spring between the abutment and the butter, a collar on the rod, and a spring between the abutment and the collar.

7-. A mechanical movement comprising in combination with a reciprocatory element, an oscillating support, a rotary unbalanced pulley thereon, a bearing, an abutment opposite thereto, a butter composed of a sleeve sliding on the bearing, and a spring opposing a movement of the sleeve, :1. rod sliding through the sleeve and the abutment and connecting the reciprocatory element to the support, a spring between the abutment and the buffer-sleeve, a collar on the rod, and a spring between the abutment and the collar.

In testimony whereof I have afiixed my signature.

WILLIAM A. BUTCHART. 

